One of the parties we went to on the 4th had a slip-n-slide (it's been over 100 degrees here every day this week) and I went on it several times. It was very fun, but I have to tell you, my abs and obliques are killing me today. I can hardly believe it. I abhor doing crunches and usually don't bother to do them so my abs are relatively weak--but I'm thinking I might have to invest in a slip-n-slide, you know, to work my abs